KR20010047457A - Polypropyrene chip for manufacturing of non-woven fabric that having ultraviolet rays stability and preparation of non-woven fabric that having ultraviolet rays stability therefrom - Google Patents

Abstract

PURPOSE: Polypropylene chips blended with an ultraviolet stabilizing agent for providing ultraviolet stability to nonwoven fabrics and a process for preparation of the same are provided. Therefore, high-quality nonwoven fabrics having improved ultraviolet stability and weather resistance can be produced at low cost. CONSTITUTION: Polypropylene chips are blended with an ultraviolet stabilizing agent of formula 1 having a molecular weight of 2,000 to 3,000. The polypropylene nonwoven fabrics are prepared by a process consisting of: preparing yarn by melt spinning polypropylene chips blended with 0.5 to 5.0% by weight of an ultraviolet stabilizing agent and drawing; forming a web by dispersing the obtained yarn; combining the formed web by a needle punching method and/or a thermocompression method.

Description

Polypropyrene chip for manufacturing of non-woven fabric that having ultraviolet rays stability and preparation of non-woven fabric that having ultraviolet rays stability therefrom

The present invention relates to a nonwoven fabric, and more particularly, to a polypropylene chip capable of economically manufacturing a nonwoven fabric having excellent UV stability and a method of manufacturing an ultraviolet stable nonwoven fabric using the same.

Thermoplastic synthetic fiber nonwovens have been made up to now with polyester, nylon and / or polypropylene sole resins or composite resins thereof. Thermoplastic synthetic fiber nonwoven fabric is used for various construction materials, agricultural materials, automobile materials, medical materials and sanitary materials because of its excellent physical properties.

Specifically, polyester, nylon and / or polypropylene resins are melt-spun to prepare multifilaments or staples, which are then randomly dispersed on a porous conveyor with high-pressure air to prepare webs, which are stretched and opened and then thermocompressed. Thermoplastic synthetic fiber nonwoven fabrics have been produced by entanglement by a method or a resin bonding method.

In particular, agricultural thermal nail and house products which are exposed to ultraviolet rays (hereinafter referred to as "UV") are mainly ultraviolet rays by using a masterbatch containing ultraviolet stabilizer (hereinafter referred to as "UV masterbatch"). Thermoplastic synthetic fiber nonwovens have been produced as a method of improving the stability to the.

However, the use of a UV masterbatch to improve UV stability for agricultural thermal nails and house nonwoven products that are highly exposed to UV rays is economically and qualityly problematic. Specifically, the prior art requires additional equipment such as a master batch feeder for metering and mixing at a certain ratio in the metering and mixing of the thermoplastic resin chips at a predetermined ratio before melting and extruding. There is a problem in the uniformity of UV stability of the finished product due to heterogeneous mixing.

Accordingly, the present invention provides a thermoplastic synthetic fiber nonwoven fabric having a uniform UV stability in an economical manner by improving the economic and quality irrationality caused by using a UV masterbatch in view of the above-mentioned problems of the prior art. It is a task.

In the present inventor's research for solving the above problems, instead of using a UV masterbatch, a chip containing UV stabilizer is mixed by blending PP and UV stabilizer in the manufacturing process of raw material polypropylene (hereinafter referred to as "PP"). It has been found that the manufacturing and use of the present invention makes it possible to economically produce a thermoplastic synthetic nonwoven fabric having a uniform UV stability without requiring additional equipment such as a master batch feeder. As a result, the present invention has been completed.

1 is a view schematically showing a long fiber nonwoven fabric manufacturing apparatus.

* Brief description of the main parts of the drawing

1: hopper 2: extruder

3: spinning block 4: cooling tank

5: net conveyor 6: emboss roll

7: winder

Therefore, according to the present invention, there is provided a polypropylene chip for producing a UV stable nonwoven fabric, characterized in that the UV stabilizer is blended 0.5 to 5.0% by weight.

According to the present invention, there is provided a polypropylene chip for producing a UV stable nonwoven fabric, wherein the UV stabilizer is a compound represented by the following general formula (1) having a molecular weight of 2,000 to 3,000.

In addition, according to the present invention, in the method for producing a UV-stable polypropylene nonwoven fabric, in order to impart UV stability to the nonwoven fabric, a UV stabilizer is melt-spun and then stretched polypropylene chip blended 0.5 to 5.0% by weight to prepare a yarn After dispersing the prepared yarn to form a web, there is provided a method for producing a UV-stable polypropylene nonwoven fabric, characterized in that the nonwoven fabric is produced by needle punching and / or thermocompression bonding.

Hereinafter, the present invention will be described in more detail.

According to the present invention there is provided a polypropylene chip specifically designed for imparting UV stability to thermoplastic synthetic fiber nonwovens. The polypropylene chip of the present invention is a blend of 0.5 to 5.0% by weight of UV stabilizer, when using the polypropylene chip when melting the polypropylene chip to prepare a nonwoven fabric, do not add a separate additive such as UV masterbatch Since it is not necessary, the simplification of the apparatus can be achieved, and the nonwoven fabric to be manufactured can be given UV stability uniformly throughout, so that the quality of the nonwoven fabric can be greatly improved.

In the polypropylene chip of the present invention, when the UV stabilizer is contained in an amount of more than 5.0% by weight, the miscibility with the polypropylene is poor, resulting in poor operation, and the UV stabilizer is contained in an amount less than 0.5% by weight In this case, the UV stability of the nonwoven does not improve to the desired level.

Effective as the UV stabilizer is a compound of formula 1 having a molecular weight of 2,000 to 3,000.

Hereinafter, an example of a method of manufacturing a nonwoven fabric using the polypropylene chip of the present invention will be described with reference to the drawings.

1 schematically shows a long fiber nonwoven manufacturing apparatus. In the above apparatus, the polypropylene chip of the present invention is supplied to an extruder 2 through a dosing hopper 1 and melted, and the melted polymer is metered in a metering pump to form a spinning block ( Spinning block: 3) Extruded into multifilament by a certain amount in the detention of 3), cooled by quenching air while passing through the quenching chamber (4), and stretched through the flow of high-pressure air sucked through the lower net The stretched multifilament is randomly dispersed and integrated by a carding machine on a moving porous net conveyor 5 to form a web.

At this time, it is preferable to perform extending | stretching on condition which the single yarn fineness after extending | stretching becomes 1-20 denier. If the single yarn fineness is too thin, there is more cutting in the drawing process, which may lower the operability and reduce the strength of the final product. On the other hand, if the single yarn fineness is too thick, the operability decreases due to uneven cooling of the yarn in the spinning process.

The carding machine may be a carding device using a corona discharge method using static electricity. Of course, the multifilament produced by melt spinning can be cut to prepare short fibers (staples), and then dispersed and integrated on a porous conveyor to produce a web. In order to make the filament uniformly and stably sit on the porous conveyor, a suction brower is used to suck air. The thickness of the web can be controlled by the speed of the net conveyor.

The web thus formed is heat-sealed by the heat and pressure applied through the upper and lower rolls while passing through the emboss roll (6), thereby forming a sheet. The thermocompression process is a process of determining the physical properties of the finished product by thermally bonding the web through the embossed roll of high-temperature, high-pressure stamped pattern. Of course, the process for imparting strength to the web may employ needle punching, a resin bonding method, or the like, in addition to the above-mentioned thermocompression bonding (embossing). Generally, when the weight of the nonwoven fabric is lower than 100 g / m 2, the thermocompression method is mainly used. When the weight of the nonwoven fabric is higher than 100 g / m 2, the needle punching method is mainly used. The sheet provided with strength in this manner is wound up in the winding machine 7 to produce a product with a constant width and length.

The nonwoven fabric produced using the polypropylene chip blended with the stabilizer according to the present invention exhibits uniform UV stability throughout the product, and as a result, the physical properties of the nonwoven fabric are maintained for a long time even when used for a long time.

Features and other advantages of the present invention as described above will become more apparent from the following examples. However, the present invention is not limited to the following examples.

In the following examples and comparative examples, the UV stability (expressed in tensile strength retention) and uniformity of the thermoplastic synthetic fiber nonwoven fabric were evaluated by the following method.

* Tensile strength retention: Tensile elongation and maximum tensile strength are measured at 100m / min tensile speed after 50 hours of width and 200mm length specimen in accordance with American Standard Test Method (ASTM) D 2565.

* Uniformity: 5 samples of finished product samples shall be taken at 5m intervals and measured according to the strong maintenance rate measurement method.

<Example 1>

0.5 wt% of UV stabilizer and 99.5 wt% of polypropylene (PP) were blended in the PP manufacturing process to prepare chips. The obtained UV stabilizer containing PP chip was melted, spun and cooled to prepare a thermoplastic multifilament having a single yarn fineness of 20 denier. The thermoplastic multifilament is opened by a self-friction opening method, and then randomly dispersed on a net conveyor to form a web. The web is thermally compressed while passing through an embossing roll at 200 ° C., and the unit weight is 80 g / m 2. Phosphorous nonwovens were prepared. The physical properties of the prepared nonwoven fabric were evaluated and the results are shown in Table 2.

<Examples 2 and 3>

A thermoplastic synthetic fiber nonwoven fabric was manufactured under the same conditions and processes as in Example 1 except that the mixing ratio and the single yarn fineness of the UV stabilizer and the PP were changed as shown in Table 1. The physical properties of the prepared nonwoven fabric were evaluated and the results are shown in Table 2.

<Comparative Example 1>

A thermoplastic synthetic fiber nonwoven fabric was manufactured under the same conditions and processes as in Example 1 except that the mixing ratio and the single yarn fineness of the UV stabilizer and the PP were changed as shown in Table 1. The physical properties of the prepared nonwoven fabric were evaluated and the results are shown in Table 2.

<Comparative Example 2>

Polyethylene terephthalate (PET) chips were melt-spun and stretched in an air eject to produce PET multifilaments with single yarn fineness of 15 denier. The spun PET multifilaments were opened by self-friction cutting method and randomly onto the net conveyor. After dispersing to form a web, the prepared web was thermocompressed with an emboss roll at 200 ° C. to prepare a thermoplastic synthetic fiber nonwoven fabric having a unit weight of 80 g / m 2. The physical properties of the prepared nonwoven fabric were evaluated and the results are shown in Table 2.

<Comparative Example 3>

A thermoplastic synthetic fiber nonwoven fabric was manufactured under the same conditions and processes as in Comparative Example 2 except that PP was melt spun instead of PET. The physical properties of the prepared nonwoven fabric were evaluated and the results are shown in Table 2.

division Resin type for multifilament (composition ratio) Single yarn fineness (denier) Example 1 Blending chip of PP and UV stabilizer (PP: 99.5wt%, UV stabilizer: 0.5wt%) 20 Example 2 Blending chip of PP and UV stabilizer (PP: 95.0 wt%, UV stabilizer: 5.0 wt%) 15 Example 4 Blending chip of PP and UV stabilizer (PP: 80.0wt%, UV stabilizer: 20.0wt%) One 1 in comparison Blending chip of PP and UV stabilizer (PP: 99.9wt%, UV stabilizer: 0.1wt%) 10 Comparative Example 2 PET (PET 100%) 15 Comparative Example 3 PP (PP 100%) 15

division Strong retention rate (%) Dispersibility Cost Competitiveness Example 1 77 Good Good Example 2 84 Good Good Example 3 82 Good Good Comparative Example 1 32 Good usually Comparative Example 2 33 Bad Bad Comparative Example 3 27 Bad Bad

As can be seen from the above experimental results, the use of the polypropylene chip according to the present invention makes it possible to produce a high-quality nonwoven fabric at a lower cost, which is endowed with uniform UV stability throughout and greatly improves weather resistance. .

Claims (3)

A polypropylene chip for producing a nonwoven fabric, wherein the UV stabilizer is blended at 0.5 to 5.0% by weight and molded into a chip state. According to claim 1, wherein the ultraviolet light stabilizer has a molecular weight of 2,000 to 3,000 Polypropylene chip for producing a UV-stable nonwoven fabric, characterized in that the compound having a structure of. In the method of manufacturing an ultraviolet-stable polypropylene nonwoven fabric, in order to impart ultraviolet stability to the nonwoven fabric, a polypropylene chip blended with 0.5 to 5.0 wt% of a UV stabilizer is melt-spun and stretched to prepare yarns, and the yarns are dispersed. After forming the web, the method of producing a UV-stable polypropylene nonwoven fabric, characterized in that for forming the nonwoven fabric by needle punching and / or thermocompression bonding.